Comparison of the -1/ξ Locus Method with Classical Method for Evaluation of the Stability Margin of Multiloop Flight Control Systems

Abstract

A method to exactly evaluate the stability margin for multiloop control systems has not been established yet. In this paper, it is shown that the results of the classical method of stability margin which is used by designers of aircraft manufacturers is conservative. Previous research has proposed the “-1/ξ locus” analysis method for the evaluation of the stability margin. Using this -1/ξ locus method, more exact evaluation of the stability margin of multiloop flight control systems is presented.